In the potentiometer arrangement shown in figure, null point is obtained at length $\mathcal{l}$. Match the following ($E_2$ is an ideal cell)

COLUMN-I	COLUMN-II
P)If $E_1$ is increased	1) $\mathcal{l}$ should increase
Q)If R is increased	2)$\mathcal{l}$ should decrease
R)If $E_2$ is increased	3)$\mathcal{l}$ should remain the same to again get null point
S)If r is shunted	4)$\mathcal{l}$ becomes zero